sha1.h

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/*
 Copyright (c) 2011, Micael Hildenborg
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of Micael Hildenborg nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY Micael Hildenborg ''AS IS'' AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL Micael Hildenborg BE LIABLE FOR ANY
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 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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 */

#ifndef SHA1_DEFINED
#define SHA1_DEFINED

/**
 * \file
 * \brief SHA1 implementation
 *
 */ /******************************************************************/

/**
 * \defgroup sha1 SHA1
 * \ingroup security
 * \{
 */

#define SHA1_HASH_LENGTH      20

struct sha1_state_t {
    unsigned char t[64];
    unsigned int result[5];
    int currentBlock;
    int totalLength;
};

/**
@param state the SHA-1 hasher instance
*/
void sha1_init(struct sha1_state_t *state);

/**
@param state the SHA-1 hasher instance
@param src points to any kind of data to be hashed.
@param bytelength the number of bytes to hash from the src pointer.
*/
void sha1_calc(struct sha1_state_t *state, const void* src, int bytelength);

/**
@param state the SHA-1 hasher instance
@param hash should point to a buffer of at least 20 bytes of size for storing the sha1 result in.
*/
void sha1_commit(struct sha1_state_t *state, unsigned char* hash);

/**
@param hash is 20 bytes of sha1 hash. This is the same data that is the result from the calc function.
@param hexstring should point to a buffer of at least 41 bytes of size for storing the hexadecimal representation of the hash. A zero will be written at position 40, so the buffer will be a valid zero ended string.
*/
void sha1_toHexString(const unsigned char* hash, char* hexstring);

/** \} */

#endif // SHA1_DEFINED